-20.17% is the change from 808 to 645
Calculation steps:
[( 645 - 808 ) ÷ 808] x 100 = -20.17%
Formula
Percentage change = [(645 - 808) / 808] x 100
Subtract the new number by the original number
645 - 808 = -163
-163 ÷ 808 = -0.20173267326732675
-0.20173267326732675 x 100 = -20.17%